Preparation method and application of nano catalytic material with palladium oxide shell-nickel oxide core structure
A nano-catalytic material, palladium oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, chemical instruments and methods, etc., can solve thermal collapse, insufficient hollow structure strength, reduced efficiency, etc. question
Active Publication Date: 2021-02-02
HUNAN JIANTE TECH CO LTD
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Problems solved by technology
However, during use, it is found that the efficiency decreases after high temperature (1000°C), and thermal collapse may occur due to insufficient strength of the hollow structure
Method used
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Embodiment 1
[0024] Prepare 1000ml of nickel sulfate solution with a concentration of 0.5mol / l, and add complexing agent sodium citrate according to the molar ratio of nickel sulfate / sodium citrate=1:2. Take 500ml of hydrazine hydrate, add a certain amount of NH 4 OH to adjust the pH of the hydrazine hydrate solution to 11. Hydrazine hydrate and NH 4 The OH mixed solution is poured into the nickel sulfate solution and reacted for 5 minutes, so that the hydrazine hydrate reduces the nickel ions, and the metal nickel particles with an average particle diameter of about 200 nm are obtained.
[0025] Prepare 1000ml of palladium nitrate solution with a concentration of 0.2mol / l, add a certain amount of nitric acid to adjust the pH value of the palladium nitrate solution to 3. Under the conditions of room temperature and mechanical stirring, the nano-nickel particles prepared above were washed with deionized water and then added to a palladium nitrate solution for 20 minutes to react to obtain...
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The invention provides a method for preparing a nano-catalytic material with a palladium oxide shell-nickel oxide core structure. The invention firstly prepares nano metal nickel particles, and then utilizes the property that the potential of the metal palladium electrode is higher than that of the metal nickel to pass through the palladium ion solution. The replacement reaction between the surface of the nickel particle and the palladium ion makes the palladium ion be reduced by the metal nickel and deposited on the surface of the nickel particle to form a metal palladium cladding layer with a thickness of nanometers, so as to obtain a nanometer metal palladium-nickel composite with a palladium shell-nickel core structure particle. In glycerol, the nano-metal palladium-nickel composite particles with a palladium shell-nickel core structure are oxidized by ozone into nano-oxide composite particles with a palladium oxide shell-nickel oxide core structure that can be used as a catalyst material for automobile exhaust gas . The invention prepares nano-precious metal oxide composite particles with a palladium oxide shell-nickel oxide core structure to replace the palladium oxide particles currently used in the catalytic purifier of automobile exhaust gas.
Description
technical field [0001] The invention provides a method for preparing a nano catalytic material with a palladium oxide shell-nickel oxide core structure, belonging to the field of lighter detection and debugging equipment. Background technique [0002] Palladium oxide is a kind of excellent catalytic purification material for motor vehicle exhaust. At present, in the preparation of automobile exhaust catalytic purification materials, a certain amount of palladium salt is added to the slurry (also known as water washing slurry, English washcoat) prepared by mixing powder coating material and water ball mill and coated on the catalyst carrier. (Usually a honeycomb ceramic carrier or a metal honeycomb carrier) on the surface of dense small channels, and then the carrier coated with the catalyst is heated and baked to shape. During the sintering process, the palladium salt in the slurry is roasted and oxidized to transform into sub-micron or micron-sized palladium oxide particle...
Claims
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IPC IPC(8): B01J23/89B01J37/12B01D53/94
CPCB01D53/94B01J23/002B01J23/892B01J37/12B01J35/398
Inventor 姚小刚刘颖
Owner HUNAN JIANTE TECH CO LTD